device/main/linux-postmarketos-allwinner: Upgrade to 6.1-rc7 (MR 3678)

Kernel source updated to 6.1-rc7
Ext2 and Ext3 modules in aarch64 config disabled because Ext4 is backwards compatible.
2 fixes for PinePhone included in this source:
pinephone: fix power key behavior during suspend (avoid stuck key during resume)
pinephone keyboard: wait for 100ms after enabling power supply and before probing.

[ci:skip-build]: already built successfully in CI

(cherry picked from commit ccc870dc)